How do miners know when a stone quarry is fully tapped out?

How do miners know when a stone quarry is fully tapped out?
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1 Answer

Answer :

A stone quarry mines rock. It is obvious when the rock is gone, which is almost never. A rock quarry will also crush rock for gravel. The mine may close because the water table is too high, or quarrying at higher levels closer to ground level, for example, is more cost effective. The pit you describe sounds more like a large open pit copper mine that mines copper ore. When the ore is gone (or for other reasons) the mine closes.
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